Requesting full main pressure, can only be performed if the engine speed is 0 rpm or if the following conditions are met: Engine speed is between 500 - 1500 rpm, gearbox oil temperature is between 35°C - 110°C (95°F - 230°F), PTO status is not on, output speed is between 0 - 25 rpm, gear in neutral or the clutch test mode requests a non-neutral gear. Shifting gears when full main pressure is activated may triggering the fault codes.